5.4.2.16 IfcOpeningElementTypeEnum

5.4.2.16.1 Semantic definition

This enumeration defines the basic types for opening elements.

Type	Description
`OPENING`	An opening as subtraction feature that cuts through the element it voids. It thereby creates a hole. An opening in addition has a particular meaning for either providing a void for doors or windows, or an opening to permit flow of air and passing of light.
`RECESS`	An opening as subtraction feature that does not cut through the element it voids. It creates a niche or similar voiding pattern.
`USERDEFINED`	User-defined opening element.
`NOTDEFINED`	Undefined opening element.

Table A

TYPE IfcOpeningElementTypeEnum = ENUMERATION OF
(OPENING
,RECESS
,USERDEFINED
,NOTDEFINED);
END_TYPE;